| smokeless | (adjective) emitting or containing little or no smoke | - |
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| solanaceous | (adjective) of or relating to plants of the family Solanaceae (the potato family) | - |
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| soleless | (adjective) having no sole | - |
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| solicitous | (adjective) showing hovering attentiveness | - |
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| (adjective) full of anxiety and concern | - |
| somniferous | (adjective) sleep inducing | Synonyms: hypnagogic, hypnogogic, somnific, soporiferous, soporific |
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| sonorous | (adjective) full and loud and deep | Synonyms: heavy |
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| soporiferous | (adjective) sleep inducing | Synonyms: hypnagogic, hypnogogic, somniferous, somnific, soporific |
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| (adjective) inducing mental lethargy | Synonyms: narcotic, soporific |
| sorcerous | (adjective) possessing or using or characteristic of or appropriate to supernatural powers | Synonyms: charming, magic, magical, witching, wizard, wizardly |
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| soulless | (adjective) lacking sensitivity or the capacity for deep feeling | - |
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| soundless | (adjective) marked by absence of sound | Synonyms: silent, still |
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| spacious | (adjective) (of buildings and rooms) having ample space | Synonyms: roomy |
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| (adjective) very large in expanse or scope | Synonyms: broad, wide |
| specious | (adjective) plausible but false | Synonyms: spurious |
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| (adjective) based on pretense; deceptively pleasing | Synonyms: gilded, glossy, meretricious |
| speckless | (adjective) completely neat and clean | Synonyms: immaculate, spic-and-span, spic, spick-and-span, spick, spotless |
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| speechless | (adjective) temporarily incapable of speaking | Synonyms: dumb |
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| spermous | (adjective) consisting of or resembling spermatozoa | Synonyms: spermatic |
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| spineless | (adjective) lacking spiny processes | - |
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| (adjective) lacking a backbone or spinal column | Synonyms: invertebrate |
| (adjective) lacking courage or vitality | Synonyms: gutless, namby-pamby, wishy-washy |
| (adjective) lacking thorns | Synonyms: thornless |
| spinous | (adjective) having spines | Synonyms: spiny |
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| (adjective) shaped like a spine or thorn | Synonyms: acanthoid, acanthous |
| spiritless | (adjective) lacking ardor or vigor or energy | - |
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| (adjective) evidencing little spirit or courage; overly submissive or compliant | Synonyms: meek |
| spiritous | (adjective) containing or of the nature of alcohol | Synonyms: spirituous |
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| spirituous | (adjective) containing or of the nature of alcohol | Synonyms: spiritous |
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| splendiferous | (adjective) having great beauty and splendor | Synonyms: glorious, resplendent, splendid |
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| splinterless | (adjective) resistant to shattering or splintering | Synonyms: shatterproof, splinterproof |
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| spontaneous | (adjective) happening or arising without apparent external cause | Synonyms: self-generated |
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| (adjective) said or done without having been planned or written in advance | Synonyms: ad-lib, unwritten |
| sporogenous | (adjective) producing spores or reproducing by means of spores | - |
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| spotless | (adjective) completely neat and clean | Synonyms: immaculate, speckless, spic-and-span, spic, spick-and-span, spick |
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| springless | (adjective) lacking in elasticity or vitality | - |
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| spurious | (adjective) false or fake; not what it appears to be | Synonyms: inauthentic, unauthentic |
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| (adjective) plausible but false | Synonyms: specious |
| (adjective) born out of wedlock | Synonyms: bastardly, misbegot, misbegotten |
| (adjective) ostensibly valid, but not actually valid | - |
| stainless | (adjective) (of reputation) free from blemishes | Synonyms: unstained, unsullied, untainted, untarnished |
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| stalkless | (adjective) attached directly by the base; not having an intervening stalk | Synonyms: sessile |
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| stannous | (adjective) of or relating to or containing tin | Synonyms: stannic |
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| starchless | (adjective) lacking starch | - |
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| starkers | (adjective) (British informal) stark naked | - |
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| starless | (adjective) not starry; having no stars or starlike objects | - |
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| stateless | (adjective) without nationality or citizenship | Synonyms: homeless |
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| stemless | (adjective) not having a stem | - |
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| (adjective) (of plants) having no apparent stem above ground | Synonyms: acaulescent |
| stertorous | (adjective) of breathing having a heavy snoring sound | - |
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| stingless | (adjective) without a sting | - |
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| stoloniferous | (adjective) producing stolons | - |
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| stomatous | (adjective) having a mouth or mouthlike opening | - |
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| (adjective) relating to or constituting plant stomata | Synonyms: stomatal |
| (adjective) relating to or of the nature of or having a mouth or mouthlike opening | Synonyms: stomatal |
| stoneless | (adjective) (of fruits having stones) having the stone removed | - |
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| strapless | (adjective) having no straps | - |
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| strenuous | (adjective) taxing to the utmost; testing powers of endurance | Synonyms: arduous, straining |
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| (adjective) characterized by or performed with much energy or force | - |
| studious | (adjective) marked by care and effort | - |
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| (adjective) characterized by diligent study and fondness for reading | Synonyms: bookish |
| stupendous | (adjective) so great in size or force or extent as to elicit awe | Synonyms: colossal, prodigious |
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| stuporous | (adjective) stunned or confused and slow to react (as from blows or drunkenness or exhaustion) | Synonyms: dazed, foggy, groggy, logy |
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| styleless | (adjective) lacking in style or elegance | Synonyms: unstylish |
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| subaqueous | (adjective) growing or remaining under water | Synonyms: subaquatic, submerged, submersed, underwater |
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| subconscious | (adjective) just below the level of consciousness | - |
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| subcutaneous | (adjective) relating to or located below the epidermis | Synonyms: hypodermic |
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| subgross | (adjective) too small to be visible to the naked eye | - |
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| subterraneous | (adjective) lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) | Synonyms: subterranean, ulterior |
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| (adjective) being or operating under the surface of the earth | Synonyms: subterranean |
| sugarless | (adjective) not containing sugar | Synonyms: nonsweet |
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| sulfurous | (adjective) of or related to or containing sulfur or derived from sulfur | Synonyms: sulphurous |
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| (adjective) characterized by oppressive heat and humidity | Synonyms: stifling, sulphurous, sultry |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulphurous, virulent, vitriolic |
| sulphurous | (adjective) of or related to or containing sulfur or derived from sulfur | Synonyms: sulfurous |
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| (adjective) characterized by oppressive heat and humidity | Synonyms: stifling, sulfurous, sultry |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, virulent, vitriolic |
| sumptuous | (adjective) ostentatiously rich and superior in quality | Synonyms: deluxe, gilded, grand, lush, luxurious, opulent, princely |
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| sunless | (adjective) filled or abounding with clouds | Synonyms: cloud-covered, clouded, overcast |
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| supercilious | (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: disdainful, haughty, imperious, lordly, overbearing, prideful, sniffy, swaggering |
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| (adjective) expressive of contempt | Synonyms: sneering, snide |
| superfluous | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, supererogatory, supernumerary, surplus |
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| (adjective) serving no useful purpose; having no excuse for being | Synonyms: otiose, pointless, purposeless, senseless, wasted |
| superstitious | (adjective) showing ignorance of the laws of nature and faith in magic or chance | - |
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| supperless | (adjective) without supper | - |
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| suppositious | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, hypothetical, supposed, suppositional, supposititious |
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| supposititious | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, hypothetical, supposed, suppositional, suppositious |
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| surplus | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, supererogatory, superfluous, supernumerary |
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| surreptitious | (adjective) marked by quiet and caution and secrecy; taking pains to avoid being observed | Synonyms: furtive, sneak, sneaky, stealthy |
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| (adjective) conducted with or marked by hidden aims or methods | Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, undercover, underground |
| suspicious | (adjective) openly distrustful and unwilling to confide | Synonyms: leery, mistrustful, untrusting, wary |
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| (adjective) not as expected | Synonyms: fishy, funny, shady, suspect |
| susurrous | (adjective) characterized by soft sounds | Synonyms: murmurous, rustling, soughing |
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| sympetalous | (adjective) having a corolla composed of partially or wholly fused petals forming a corolla shaped like a tube or funnel | Synonyms: gamopetalous |
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| symphonious | (adjective) harmonious in sound | Synonyms: symphonic |
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| symptomless | (adjective) having no symptoms of illness or disease | Synonyms: asymptomatic |
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| syncarpous | (adjective) (of ovaries of flowering plants) consisting of united carpels | - |
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| synchronous | (adjective) occurring or existing at the same time or having the same period or phase | Synonyms: synchronal, synchronic |
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| (adjective) (digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions | - |
| synoecious | (adjective) having male and female reproductive organs mixed in the same gametoecium | Synonyms: synoicous |
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| synoicous | (adjective) having male and female reproductive organs mixed in the same gametoecium | Synonyms: synoecious |
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| synonymous | (adjective) (of words) meaning the same or nearly the same | - |
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| tactless | (adjective) lacking or showing a lack of what is fitting and considerate in dealing with others | Synonyms: untactful |
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| (adjective) revealing lack of perceptiveness or judgment or finesse | Synonyms: inept |
| tailless | (adjective) not having a tail | Synonyms: anurous |
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| talentless | (adjective) devoid of talent; not gifted | Synonyms: untalented |
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| tasteless | (adjective) lacking flavor | - |
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| (adjective) lacking aesthetic or social taste | - |
| tearless | (adjective) free from tears | Synonyms: dry-eyed |
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| tedious | (adjective) using or containing too many words | Synonyms: long-winded, verbose, windy, wordy |
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| (adjective) so lacking in interest as to cause mental weariness | Synonyms: boring, deadening, dull, ho-hum, irksome, slow, tiresome, wearisome |
| temerarious | (adjective) presumptuously daring | Synonyms: daredevil |
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| tempestuous | (adjective) (of the elements) as if showing violent anger | Synonyms: angry, furious, raging, wild |
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| (adjective) characterized by violent emotions or behavior | Synonyms: stormy |
| tenacious | (adjective) good at remembering | Synonyms: long, recollective, retentive |
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| (adjective) sticking together | Synonyms: coherent |
| (adjective) stubbornly unyielding | Synonyms: dogged, dour, persistent, pertinacious, unyielding |
| tendencious | (adjective) having or marked by a strong tendency especially a controversial one | Synonyms: tendentious |
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| tendentious | (adjective) having or marked by a strong tendency especially a controversial one | Synonyms: tendencious |
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| tendinous | (adjective) consisting of tendons or resembling a tendon | Synonyms: sinewy |
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| tenebrious | (adjective) dark and gloomy | Synonyms: tenebrific, tenebrous |
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| tenebrous | (adjective) dark and gloomy | Synonyms: tenebrific, tenebrious |
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| tensionless | (adjective) free from tension | - |
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| tenuous | (adjective) lacking substance or significance | Synonyms: flimsy, fragile, slight, thin |
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| (adjective) very thin in gauge or diameter | - |
| (adjective) having thin consistency | - |
| testaceous | (adjective) relating to or possessing a testa or hard shell | - |
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| tetramerous | (adjective) having or consisting of four similar parts; tetramerous flowers | - |
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| thankless | (adjective) not feeling or showing gratitude | Synonyms: ungrateful, unthankful |
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| (adjective) not likely to be rewarded | Synonyms: unappreciated, ungratifying |
| thornless | (adjective) lacking thorns | Synonyms: spineless |
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| thoughtless | (adjective) showing lack of careful thought | - |
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| (adjective) without care or thought for others | Synonyms: uncaring, unthinking |
| thriftless | (adjective) careless of the future | - |
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| thunderous | (adjective) loud enough to cause (temporary) hearing loss | Synonyms: deafening, earsplitting, thundery |
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| (adjective) extremely ominous | - |
| timeless | (adjective) unaffected by time | Synonyms: dateless |
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| timorous | (adjective) timid by nature or revealing timidity | Synonyms: fearful, trepid |
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| tireless | (adjective) characterized by hard work and perseverance | Synonyms: hardworking, industrious, untiring |
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| (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: indefatigable, unflagging, unwearying |